The Zero Dark Thirty actress, who turns 37 Monday, spent the weekend in Toronto with friends. "There was a delicious dinner at Brassaii, ping pong matches, crazy dancing and karaoke," she revealed. "The past few years has been so wonderful and full of work that I sometimes feel like I live on a film set. It was great to spend time with my nearest and dearest. It's a reminder of what's important in life."

Chastain shared six photos with her Facebook friends, including one with Tom Hiddleston. Thanks to Twitter, the actors were falsely rumored to be dating in early 2013. "Why would they say that?" she asked during a USA Today interview. "It's not true at all." They co-star in the movie Crimson Peak, slated for release on Oct. 16, 2015. The Help star is dating Gian Luca Passi de Preposulo, who also attended her birthday bash.

The actress next stars in Interstellar, which also features Matthew McConaughey and Anne Hathaway. Directed by Christropher Nolan and arriving in theaters Nov. 7, it tells the story of space explorers who travel through a wormhole. Chastian also appears in the movie Miss Julie, co-starring Colin Farrell.

Chastian recently wrapped production on A Most Violent Year, set in 1981 Manhattan. "Working with talent like JCChandor and OscarIsaac are the reason I love my job," she raved on Facebook. "I'm a very lucky girl."